The FW touch sensors are capacitive and contact sensitive, not pressure sensitive. It seems the Mac mouse has squeeze and pressure sensitivity so I would guess that they are using different techniques.
I actually read a reveiw of the Mighty Mouse. It is not "touch sensitive" at all... it has real click-buttons hidden inside. When you press down the outer shell actually depresses.
dr_leviathan: I would say that FW is partially 'pressure' sensitive in that there are gestures which can speed up based on 'pressure' -- in this case though, I think that comes from measuring a larger surface area of your finger (a side effect of pushing harder).
The FW touchpads are not pressure sensitive. But they seem to be because they measure the contact area and deduce a pressure meaning from the size of the contact area.
I thought of FW the moment I saw this on Slashdot, also. But it's clearly not related -- there is no "touchpad" technology at all -- just mechanical buttons.
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I don't see anything "mighty" about this mouse other than the price tag. And I'm a Mac user...